The most affordable CRM system according to Capterra
Unified Communications System - PBX System
Asterisk based VoIP pbx appliance
Enterprise telephony recording and retrieval system
ERP, IP PBX, Accounting, CRM, Time tracking, and etc.
VozBox. Asterisk VoIP PBX.
Respins of various open source PBX projects
This Webmin module aids in configuring the Dahdi interface to Asterisk